A chink in sb´s armour.
Example: She is the best student in the class but her poor spelling is the chink in her armour.
Spill the beans.
Example: I know you have a secret. C´mon tell me. Spill the beans.
Let the cat out of the bag.
Example: You are not good at keeping secrets. Tell us now. Let the cat out of the bag.
That´s the way the cookie crumbles.
Example: I can´t believe she decided to go to the graduation dance with Sam instead of me. But well, that´s the way the cookie crumbles.
Look like a million dollars.
Example: She looks amazing in her new dress. She looks like a million dollars.
Let´s play it by ear.
Example: Let´s make no plans for today. Let´s just play it by ear.
A white elephant.
Example: Nobody uses the computer in the teachers´ room. It´s a white elephant.
Example: He is never there when I need him.
He is a fair-weather friend.
Example: He didn´t get the job and now he is saying that he really didn't want it, but we all know it is just sour grapes.
The tip of the iceberg.
Example: The discipline problems in the school are just the tip of the iceberg. We feel they have greater and really more serious matters to worry about.
On cloud nine.
Example: She has just got the promotion she wanted and she is on cloud nine.
On the house.
A hot potato.
Example: The issue has become a political hot potato.
Like a red rag to a bull. Example: Asking about her ex-boyfriend was like a red rag to a bull. She got really angry all of a sudden.
Move at a snail´s pace.
Get something out of one´s system.
Bark up the wrong tree.
Under the weather.
Example: Claudia is not going to school today because she´s feeling a bit under the weather.
Have a whale of a time.
Example: We had a whale of a time in Mexico. Yes, indeed, it was a fantastic trip.
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